Braun tube



Oct. 26, 1937. M. von ARDENNE BRAUN TUBE Filed March 6. 1933 Fig.7

Fig. 3

Patented Oct. 26, 1937 UNITED STATES PATENT OFFICE BRAUN TUBE Application March 6, 1933, Serial N0. 659,617 In Germany March -7, 1932 2 Claims.

It is known in the case of television receivers to employ symmetrical Braun tubes, and to make use of line and image ti1ting potentials, which are necessary for scanning purposes, of difierent am- 5 plitudes, in order to obtain the well-known rectangular size. For producing the necessary tilting potentials of difierent amplitude it is necessary in arrangements f this Rind 170 employ different tilting units. This results in a relatively compilcated embodiment of the arrangement, which acts in disturbing fashion, particularly in the matter of dimensioning and also as regards any new parts which may be required.

The subject matter of ehe invention is an arrangement whlch does not reveal the disadvan- 'tages referred to.

According to the invention, line and image potentials of the same amplltude are employed. The difference in the lateral dimensions of the resulting picture is obtained by corresponding adaptation of the sensitiveness of the pairs of control plates. The sensitiveness of the pairs of control plates may be varied as required by corresponding selection of the distances between the plates and by choice of the points 0f deflection, and also by corresponding selection o1" the size 0f the plates. The size across usual at the present time may be accomplished, for example, by making the spacing of the one pair of plates equal to mm. and that of the other pair of plates equal to 8 mm. The same resu1t may also be obtained by making the length of the one pair of p1ates 20 mm., and that of the other pair 30 mm.

Naturally, these statements represent merely examples of possible forms of embodiment. The essential feature of the invention is merely the 'use of tiltlng potentials of the same amplitude and defiecting p1ates of different sensitiveness.

Two f0rms of embodiment of the invention are illustrated by way of example in the drawing.

Fig. 1 shows an arrangement, in Which the intermediate spaces 2 and 4 between the pairs of plates I and 3 are of difierent size. The distances 2 and 4 may be, for example, as 5:8. II] is the cathode, I2 the anode and I3 the fluorescent screen; II is an electrode for controlling and concentrating the cathode ray. I4 and I5 are two deflecting voltage generators supplying the deflecting systems I and 3 with the defie'dting voltage.

Fig. 2 shows an arrangement, in which the plates cf the two pairs I and. 3 possess different lengths 5 and 6. For example, 5 may possess a length of mm., and 6 a length of 30 mm.

Naturally it is quite readily possib1e to make the p1ates or the spacing of other size. It is also possible to utilize several measures ab the same time.

According 130 the invention the tube, in order to fix definitely on the transverse size, is socketed accordingly, for example is furnished with a base 'not capable of being exchanged, in such fashion that the unsymmetrical taube according to the invention 'may be operated on1y in the correct position i. e. on1y in one cf the two preferred directlons. Naturally the use of corresponding mountings incapable of being exchanged, and fitted in the correct position, is essential for thia purpose of the invention.

Fig. 3 shows a television arrangement, wherein a Braun tube, which may preferably show a form cf embodiment according to Fig. 1 or 2, is arranged. in an exactly defined correct position.

By reference to Fig. 3 of the drawing it will be seen that the tube 1 with the socket 8 is inexchangeably held in the holder 9. The socket 1 in the holder 8 is oonstructed in such a manner that the deflecting plates of the taube have an exactly defined position, when the taube is mounted in the holder. The holder itse1f may be mounted in any adapted manner.

I claim:

1. A Braun tube for television purposes comprising a cathode, an anode, means to control the cathode ray, means to concentrate a cathode ray and a fiuorescent screen, two pairs of deflecting plates, the distance between the plates of the first pair standing in the ratio of approximately 5:8 to the distanoe between the plates of the second pair.

2. A Braun tube for television purposes comprising a cathode, an anode, means to contro1 the cathode ray, means 130 concentrate a cathode ray and a fluorescent screen, two pairs of deflecting plates mounted between said anode and said fluorescent screen, the spacing of the plates of the one pair amounting 110 nearly 5 mm. and that of the other pair to near1y 8 mm.

MANFRED VON ARDENNE. 

